Coulometric Kaiser moisture meter indicating electrode maintenance

Coulometric Kaiser moisture meter indicating electrode maintenance:

1. The indicator electrode for Karlsham's moisture measurement is a monomer platinum rod electrode or a monomer platinum ring electrode.

2, the use of new electrodes Note: The new indicator electrode requires a running-in time to form a new electrode surface. Titration can take a long time during this period, resulting in a high measurement result. After a short time, the phenomenon will disappear. In order to shorten the running time of the new indicator electrode, the coulometer can run overnight.

3, electrode placement: In the usual use of the process should pay attention to the protection of Pt wire, do not place the indicator electrode upright, so as not to damage the Pt wire; remove the indicator electrode after the electrode is placed across the pad with soft material (towel or Small sponge) on the countertop.

4. Use procedure: The double Pt wire of the indicator electrode should be kept as parallel as possible. Be careful when inserting the liquid surface.

5. Electrode cleaning: After the electrode is used for a period of time, due to sample contamination and other reasons, there is a passivation phenomenon. The indicator electrode can be cleaned with abrasive agent (aluminum oxide or toothpaste). Use cotton to carefully wipe off the contaminated indicator electrode, and then wash with ethanol. .